virsh: always restart virthosts libvirtd
virsh: always restart virthosts libvirtd

We hit repeatedly some issue with libvirt thinking
it received no reply from dbus
(ListActivatableNames error in messages)
atm we do not know when/why such situation happens,
so lets always restart libvirtd at beginning of
provisioning as that seems to 'fix' the problem.

Change-Id: I4c64b51a45482c11879b4bd824424e3179d206a8

redhat-openstack/infrared,okolisny/InfraRed,okolisny/InfraRed,redhat-openstack/infrared,okolisny/InfraRed,redhat-openstack/infrared